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Message: <blockquote data-quote="t2ribena" data-source="post: 305870" data-attributes="member: 3847">if i am not mistaken the magnesium material for the N52 engine block is on the outer structure of the block only and the piston liner is still aluminium alloy...in other words the normal (not really normal as BMW uses Alusil for the liners) aluminium piston liner is still there but they only forms the inner part of the entire block only and the remaining structure being magnesium alloy to save weight...IMO no one has the technology to make use of the entire magnesium alloy block construction yet which includes the piston liners to work with other material pistons...but since this is a new technology that BMW uses, not much has been known on how both material would behave is real world application in different part of the countries as both material expands and shrink at different temperature... also since it is designed to be at such minimal tolerance between the moving parts like the pistons and its liner, usage of the 'thin' 5W-30 engine oil, minimal change in the tolerance would caused significant changes to its behaviour...for example the famous engine oil dissapearance...just my 2 cents...:rock:</blockquote>